The phase-response effect of size-dependent optical enhancement in a single nanoparticle

Chen-Han Huang,Cheng-Hsiang Lin,Hsing-Ying Lin,Yun-Chiang Lan,Hsiang-Chen Chui,Shi-Wei Chu

doi:10.1364/oe.16.009580

Abstract

We demonstrate detailed simulations and experiments of near-field phase-response in a single silver nanoparticle. The plasmon-photon interaction is directly observed in the vicinity of silver nanoparticles through a near-field scanning optical microscope (NSOM). Our results manifest the correlation of phase-response and size-dependent optical enhancement. Detailed interference behaviors between optical excitation and plasmon mediated re-radiation are revealed on a single particle basis. This observation facilitates nano-applications in controlling the spatial distribution of surface plasmon (SP) modes by means of nanostructures.

Highlights

With the rapid advance of nanophotonics, the optical effects of metal nanoparticles, such as surface plasmonic resonance (SPR), surface enhanced Raman scattering (SERS), are always attractive for basic phsyics and a lot of applications
We tried to analyze near-field phase-response in a single silver nanoparticle (NP), a pair of NP, and extending to nanostructure. It is well-known that optical properties of metal nanoparticles strongly depend on plasmon resonance modes, which can be tuned via controlling the particle’s size, shape and distance between each other [1]
Detailed interference behaviors between optical excitation and plasmon mediated re-radiation are revealed on a single particle basis

Summary

Introduction

Optics Express Vol 16, No 13 9580-9586 JUN 23(2008) With the rapid advance of nanophotonics, the optical effects of metal nanoparticles, such as surface plasmonic resonance (SPR), surface enhanced Raman scattering (SERS), are always attractive for basic phsyics and a lot of applications. We tried to analyze near-field phase-response in a single silver nanoparticle (NP), a pair of NP, and extending to nanostructure. It is well-known that optical properties of metal nanoparticles strongly depend on plasmon resonance modes, which can be tuned via controlling the particle’s size, shape and distance between each other [1].

Results

Conclusion